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Re: ReplaceAll evaluation

• To: mathgroup at smc.vnet.net
• Subject: [mg104439] Re: [mg104391] ReplaceAll evaluation
• From: Leonid Shifrin <lshifr at gmail.com>
• Date: Sat, 31 Oct 2009 01:54:57 -0500 (EST)
• References: <200910300718.CAA27697@smc.vnet.net>

Hi Rui,

I would make my own function with a HoldFirst attribute.

ClearAll[replaceAllUnevaluated];
SetAttributes[replaceAllUnevaluated, HoldFirst];
replaceAllUnevaluated[expr_, rules_] := Unevaluated[expr] /. rules;


Regards,
Leonid



On Fri, Oct 30, 2009 at 10:18 AM, Rui <rui.rojo at gmail.com> wrote:

> I found myself writing Unevaluate[blabla..balbal] /. Rules way too
> often. Most of the times I don't want the /. to evaluate it before
> replacing.
> Is there any nice way to do it?
> Or I should set the attribute HoldFirst, or type that all the time, or
> create my own function?
> Thanks
> Rui Rojo
>
>

• References:
  • ReplaceAll evaluation
    • From: Rui <rui.rojo@gmail.com>